| US Size | Inner Diameter (mm) | Inner Diameter (inches) | Inner Circumference (mm) | Inner Circumference (inches) |
| 5 | 15.7 | 0.61 | 49.3 | 1.94 |
| 6 | 16.5 | 0.65 | 51.9 | 2.04 |
| 7 | 17.4 | 0.68 | 54.4 | 2.14 |
| 8 | 18.2 | 0.71 | 57.0 | 2.24 |
| 9 | 18.9 | 0.74 | 59.5 | 2.34 |
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| US Size | Inner Diameter (mm) | Inner Diameter (inches) | Inner Circumference (mm) | Inner Circumference (inches) |
| 5 | 15.7 | 0.61 | 49.3 | 1.94 |
| 6 | 16.5 | 0.65 | 51.9 | 2.04 |
| 7 | 17.4 | 0.68 | 54.4 | 2.14 |
| 8 | 18.2 | 0.71 | 57.0 | 2.24 |
| 9 | 18.9 | 0.74 | 59.5 | 2.34 |